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W. M. PAGE 8v E. B. KRAUSSR PROGBSS 0F AND 'APPARATUS FOB. TREATING BARIUM SU'LPHATE.

No. 365,318. 'Patented June 21, 1887,-

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UNITED i' STATES PATENT OFFICE.

WILLIAM M. PAGE AND EMIL B. KRAUSSE, OF ST. LOUIS, MISSOURI; ANNA L. KRAUSSE EXECUTRIX OF SAID EMIL B. KRAUSSE, DECEASED.

PROCESS 0F AND APPARATUS FOR TREATING BARIUM SULPHATE.

SPECIFICATION forming part of Letters Patent No. 365,318, dated June 21, 1887.

Application iilcd May 8, 1886. Serial No. 201,558. (No model.) i

To (LZZ whom, it may concern:

Be it known that we, WILLIAM M. PAGE and EMIL B. KRAUSSE, of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Apparatuses for and the Process of Manufacturing Sulphate of Barytes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, and which is a side elevation, part in section, showing an apparatus for carrying out our improved process.

Our invention relates to an improved apparatus for and lan improved process of preparing or manufacturing what-is known as sulphate of barytes;7 and our invention consists in the apparatus and process hereinafter fully described, and pointed out in the claims.

We will describe the different steps of our improved process in their order, referring to the improved apparatus shown in the draw- In s. 1

he tiff by which is meant the crude heavy spar as it comes from mines, isiirst placed in a grinding-mill, A, where it is crushed and broken, and from where it is taken by means of a conveyer, B, to a vat or tank, C. In this vat or tank is placed a mixture of sulphuric acid and water heated by means of steam conveyed through a pipe, D, or by other suitable means, to or above boiling-point, for the purpose of freeing the valuable part of the barytes from the foreign and refuse matter. From this tank or vat the Inaterial is taken to a second tank or vat, E, where it is washed in clear hot water to clean the refuse portion off the valuable portion. From this tank or vat the material is taken to` a pan, F, heated by steam, circulated through a false bottom, G, or by other suitable means. In this pan the material is dried, and is then passed to a mill, H, where it is ground into a iour or fine particles. It passes from the mill to a conveyer, I, which carries it to a hot water tank, J, which is provided with means for heating it, (we have shown a steam-pipe, L, for this purpose) and which is also preferably provided with astirrer, M, to keep the kmaterial in motion. The treatment of the fine subsequent more ready separation of the finest particles from the coarser. This we have found `out by practical experiment, the reason being,

perhaps, that the finest particles separate more freely when subjected to the treatment in hot water and subsequent screening. XVe have also discovered that with the use of hot water the finished article has a finer, softer, and

glossier appearance than it had when treated.

to pass through this screen or reel, while the l.heavier and coarser particles are discharged therefrom through a chute, yO, and are taken back to the mill H to be regrouud.. The particles that pass through the screen fall upon a separating conveyor, P. This conveyer is slightly inclined, aud as the material passes slowly through it (it will be understood that it is in a plastic, moist state, as it has not been dried since leaving the tank J) the coarser particles, which are too large and coarse for the trade, settle to the bottom of the conveyer, while the finer particles pass on and are discharged into a settling-tank, Q. Vhen the machine 4is stopped, the heavier particles may be cleaned out of the separator P and taken to the mill H, where they are reground. tank Q the hner material settles and the water is drawn oby any suitable means. The material is then drawn off through a spout, R, and placed in the drying-pan T, which is heated .by means of steam .circulated through a false quality of this article of commerce, and to produce it quickly, with little trouble or expense, as the various parts of the apparatus are automatic in their operation.

We do not wish to confine ourselves to the method shown and described for treating the V material before it is discharged into the tank In the` IOO J', as it may bc accomplished by other means than that we have shown and described; nor do we wish to confine ourselves to the exact method of treating after. it leaves the sandtank, as the same could be varied without departing from the essential part of our invention.

ln the patentissued to ns on the 15th day of September, 1868, No. 82,15% hot water was used, as in this process, in the treatment ofthe material before it reached the stirring-tank, but We have found that the use of hot Water for the treatment of the material in such tank, as we now do, produces a liner, softer, and glossier article.

Ne do not herein claim anything shown, described, or claimed in our former patent above referred to; but

What We do claim, and desire non' to scenre by Letters Patent, is-

l. The improved process herein shown and described of manufacturing sulphate of bary tes, cousistngin treating the material to pow der it and separate it from the refuse matter, then subjecting it to the action of hot liquid, and then separating the fine particles from the coarse ones, substantially as specified.

2. The improved process herein shown and described oi' manulhcturing sulphate of barytes, which consists in first grinding the mate rial, then boiling it, then washing it, then drying it, then grinding it, then subjecting it to the action of hot Water, then screening it, then separating it, then settling it, and inall y drying it, substantially as specified.

3. VThe improved apparatus herein shown and described for manufacturing sulphate of barytes, consisting of the combination of a mill, conveyer, tank into which the conveyor discharges and which is provided with means for heating it, washing-tank, drier provided with means for heating it, mill into which the material is discharged from the drier, convcyer, hot-Wa ter tank into which the material is discharged from the conveyor and which is provided with means for heating it, screen, Separatingconveyer into which the material falls from the screen, settlingtank into which the material falls from the conveyer, and drying-pan provided with means for heating it, all substantially as shown and described, for the purpose set forth.

VILLTAM M. PAGE. EMIL B. KRAUSSE.

in presence of- Gno. H. KNIGHT, JOE XVAIILE. 

